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Analog Devices Inc. LT8614EUDC#PBF
- Part No.:
- LT8614EUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8614EUDC#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:16,432
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Product details
Overview
LT8614EUDC#PBF from Analog Devices is a 42V, 4A synchronous step-down Silent Switcher regulator with 2.5µA quiescent current in regulation, peak current mode control, and 30ns minimum on-time. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT), supports input range 3.4V–42V, and features integrated power switches in a 3mm × 4mm QFN-18 package for automotive and industrial DC/DC conversion.
For engineers reviewing the LT8614EUDC#PBF datasheet, LT8614EUDC#PBF pinout, LT8614EUDC#PBF application, or LT8614EUDC#PBF equivalent, key selection criteria include ultralow IQ in Burst Mode, EMI-optimized Silent Switcher architecture, adjustable 200kHz–3MHz switching frequency via RT pin, ±9% PG threshold accuracy, and AEC-Q100 qualification for automotive supplies.
Technical Context
The LT8614EUDC#PBF implements peak current mode control with internal compensation, enabling stable operation without external loop components. Its Silent Switcher architecture uses symmetrical layout and integrated BST capacitor routing to suppress magnetic field emissions, achieving CISPR 25 Class 5 radiated EMI compliance without shielding.
It supports three operating modes: Burst Mode (SYNC low, IQ = 2.5µA), pulse-skipping (SYNC high or >3V), and external clock synchronization (SYNC driven by external oscillator). Frequency foldback activates during low-VOUT conditions unless SYNC is held high, improving overload robustness with saturated inductors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - enables direct battery-fed operation in 12V/24V/36V automotive and industrial systems without pre-regulation. |
| Output Current | 4A continuous - supports high-power microcontrollers, FPGAs, and sensor clusters without external current boosting. |
| Quiescent Current | 2.5µA in Burst Mode regulation - extends battery life in always-on telematics, ADAS sensors, and IoT edge nodes. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization between size (high-freq, small inductor) and light-load efficiency (low-freq burst). |
| Min. On-Time | 30ns - enables high VIN-to-low VOUT conversion (e.g., 42V→3.3V) at 2MHz without pulse skipping. |
| Feedback Reference | 0.970V ±0.006V - ensures tight output regulation across temperature and line/load variations for precision analog rails. |
| PG Accuracy | ±9% of VREF - provides reliable power-good signaling for sequenced startup in multi-rail systems. |
Pinout & Package
LT8614EUDC#PBF is housed in an 18-lead 3mm × 4mm plastic QFN (UDC package) with exposed SW pads (pins 21, 22) requiring solder connection to PCB for thermal and electrical performance. Pin 5 and pin 12 are omitted; GND1 (pins 6,7), GND2 (pins 10,11), and SW (pins 8,9,21,22) are multiplexed for low-inductance power return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UV (14) | Enable / Input Undervoltage Threshold | Hysteretic 1.00V rising / 0.96V falling threshold - enables programmable VIN brownout protection using resistor divider. |
| RT (15) | Frequency Programming | Resistor-to-ground sets switching frequency from 200kHz to 3MHz - determines inductor size, ripple, and EMI profile. |
| TR/SS (16) | Soft-Start / Output Tracking | 2.2µA internal current source - controls output ramp rate via capacitor; enables voltage sequencing with other regulators. |
| SYNC/MODE (17) | Mode Selection / Clock Sync | Ground = Burst Mode; >3V = pulse-skipping; external clock = synchronized operation - selects trade-off between IQ and transient response. |
| PG (19) | Power-Good Monitor | Open-drain output asserting when FB is within ±9% of 0.97V - used for system enable, fault latching, or rail sequencing. |
| FB (20) | Feedback Input | Regulates to 0.970V reference - connects to resistor divider; 4.7pF–22pF phase-lead cap improves stability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher Architecture | Reduces radiated EMI by >30dB vs conventional buck converters - eliminates need for metal shields or ferrite beads in automotive ECU designs. |
| Ultralow Quiescent Current | 2.5µA IQ in regulation at no load - enables >10-year battery life in always-on vehicle event recorders and remote sensors. |
| Fast Minimum On-Time | 30ns enables 42V→3.3V conversion at 2MHz - supports compact 2.2µH inductors while maintaining PWM control down to 8% duty cycle. |
| AEC-Q100 Qualified | Grade E (–40°C to +125°C junction) - certified for engine bay, transmission control, and ADAS camera modules per automotive reliability standards. |
| Inductor Saturation Tolerance | Safe operation under overload with saturated inductor - prevents thermal runaway during short-circuit or cold-crank transients. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module Rail |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codec in head unit with 12V battery input subject to load dump and cold-crank. IC Role / Device Role / Timing Role: Primary 5V/4A buck regulator with Burst Mode for standby, synchronized switching to avoid beat frequencies with CAN/FlexRay clocks. Use Value: Meets CISPR 25 Class 5 radiated limits without shielding; 2.5µA IQ extends backup battery runtime during ignition-off monitoring. |
Use Scenario: Generates isolated 3.3V rail for microcontroller and digital I/O in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: High-reliability step-down converter handling 24VDC industrial supply with wide input tolerance and overvoltage survival. Use Value: 42V absolute max rating withstands 40V transients; AEC-Q100 qualification ensures long-term stability in factory-floor thermal cycling. |
| GSM Base Station RF Power Amplifier Bias | Medical Portable Diagnostic Imaging |
Use Scenario: Supplies clean 5V bias to GaN RF power amplifier stages in small-cell base stations with strict EMI requirements. IC Role / Device Role / Timing Role: Low-noise, high-frequency buck converter operating at 2MHz to avoid interference with LTE/5G bands. Use Value: Silent Switcher layout reduces conducted/radiated noise below -60dBm in 30–1000MHz band - eliminates post-conversion filtering. |
Use Scenario: Powers FPGA, ADC, and image sensor in handheld ultrasound probe with Li-ion battery and strict thermal constraints. IC Role / Device Role / Timing Role: Efficient 12V→3.3V conversion with soft-start tracking to coordinate with analog front-end power-up sequence. Use Value: 30ns min on-time supports 12V→3.3V at 2MHz; 3mm×4mm QFN minimizes PCB area in space-constrained probe housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640S-1 | Higher 8A output, same 42V input, 2.5µA IQ, but requires external compensation and lacks TR/SS tracking. | Better suited for higher-current FPGA cores; not drop-in due to different pinout and missing soft-start tracking. | Select LT8640S-1 only when >4A output or tighter transient response is required; redesign needed for feedback and sequencing. |
| MPQ4420AGL-A | 42V/2A, 17µA IQ, no Burst Mode, no SYNC pin, non-AEC-Q100, smaller 3x4 QFN-12 package. | Lower cost for non-automotive industrial use; insufficient current and IQ for automotive always-on functions. | Choose MPQ4420AGL-A for cost-sensitive 2A applications where EMI and ultra-low IQ are not critical. |
Compared with LT8614EUDC#PBF, LT8640S-1 offers higher current but sacrifices integration and ease of sequencing, while MPQ4420AGL-A trades away automotive qualification, EMI performance, and quiescent current - making LT8614EUDC#PBF optimal for AEC-Q100-compliant, low-EMI, battery-sensitive designs.
Availability
LT8614EUDC#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, GSM RF power supplies, and portable medical imaging devices requiring stable component supply, long lifecycle support, and AEC-Q100 compliance.
Supply support for LT8614EUDC#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LT8614EUDC#PBF belongs to Analog Devices' Silent Switcher® power management product line, engineered specifically for automotive and industrial applications demanding ultra-low EMI, high efficiency across load ranges, and robust operation under harsh voltage transients.
FAQ
What is the maximum input voltage rating for LT8614EUDC#PBF?
The LT8614EUDC#PBF has an absolute maximum input voltage rating of 42V on VIN1 and VIN2 pins, with guaranteed operation from 3.4V to 42V. This allows direct connection to 24V and 36V industrial buses and 12V automotive batteries including load-dump transients up to 40V. Exceeding 42V risks permanent damage per Absolute Maximum Ratings.
Does LT8614EUDC#PBF support output voltage tracking during startup?
Yes, the LT8614EUDC#PBF supports output voltage tracking via the TR/SS pin. When TR/SS voltage is below 0.97V, the regulator forces FB to match TR/SS voltage, enabling precise sequencing with other rails. An internal 2.2µA current source allows capacitor-based soft-start ramp control - a feature confirmed in the Applications Information section and pin function description for TR/SS (Pin 16).
Is LT8614EUDC#PBF qualified for automotive applications?
Yes, the LT8614EUDC#PBF is AEC-Q100 qualified for Grade E (–40°C to +125°C junction temperature) and designated for automotive use. The datasheet explicitly lists "AEC-Q100 Qualified for Automotive Applications" under FEATURES and confirms automotive-grade temperature range in the ORDER INFORMATION table for part number LT8614EUDC#PBF.
How does the SYNC/MODE pin affect LT8614EUDC#PBF operation?
The SYNC/MODE pin configures three distinct modes: grounding enables low-IQ Burst Mode (2.5µA); applying ≥3V enables pulse-skipping mode (higher IQ, faster transients); and applying an external clock synchronizes switching. This behavior is documented in the PIN FUNCTIONS section (Pin 17) and OPERATION chapter, with timing waveforms shown in Figures G32–G34.
What thermal considerations apply to LT8614EUDC#PBF's exposed SW pads?
The LT8614EUDC#PBF exposes SW on pins 21 and 22 (bottom pad), which must be soldered to the PCB's SW copper pour for thermal and electrical performance. The datasheet specifies θJC(PAD) = 12°C/W and mandates connecting the pad to SW - not ground - to maintain low thermal resistance and prevent voltage offset errors in high-current paths.
LT8614EUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN, 18 Leads, Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 4A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8614EUDC#PBF FAQ
1.How can I place an order for LT8614EUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8614EUDC#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8614EUDC#PBF reliable?
The price and inventory of LT8614EUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8614EUDC#PBF is usually 5 days.
3.What payment methods are accepted for LT8614EUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8614EUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8614EUDC#PBF?
LT8614EUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8614EUDC#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8614EUDC#PBF?
For technical support, including LT8614EUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8614EUDC#PBF requirements.
6.How does Aetrix verify that LT8614EUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LT8614EUDC#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8614EUDC#PBF meets industry standards.
7.What is the process for return or replacement of LT8614EUDC#PBF?
All LT8614EUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8614EUDC#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8614EUDC#PBF part is unused and in its original packaging.
Return procedure for LT8614EUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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